Air switch



FIG. 1 is a perspective view of an air switch showing my new design;

FIG. 2 is a right side elevational view thereof, the other side being a mirror image;

FIG. 3 is a bottom plan view thereof; and

FIG. 4 is an end elevational view thereof.

The cord element is fragmentarily shown on the drawing to indicate indeterminate length. 

The ornamental design for an air switch, substantially as shown and described. 